<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-row>
        <el-alert title="添加商品信息" type="info" center show-icon></el-alert>
      </el-row>
      <!-- 让step步骤条和tab栏数据联动的方法是让两个共用一个数据项activeIndex -->
      <!-- 步骤条区域 -->
      <!-- active只接受数值型的，通过-0可以隐式转换成数字型 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab区域 -->
      <!--注：el-tabs不能包着el-form  el-form可以包着el-tabs -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        :label-position="'top'"
      >
        <!-- v-model绑定的是字符串型的 
        绑定值，选中选项卡的 name-->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeLeave"
          @tab-click="changeTabs"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cd" :key="i" v-for="(cd,i) in item.attr_vals" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--action 图片要上传到的api地址 -->
            <!-- on-preview 处理图片预览效果 -->
            <!-- on-remove 处理移除图片的操作 -->
            <!-- list-type 文件列表的类型 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"/>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="picDialogVisible" width="30%">
      <img :src="previewPath" width="100%">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详细描述
        goods_introduce: '',
        // 商品的参数（数组），包含 动态参数 和 静态属性
        attrs: []
      },
      // 添加商品表单数据验证
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 保存商品分类数据
      cateList: [],
      // 配置级联菜单中数据如何展示
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数列表数据
      manyTabData: [],
      // 静态参数列表数据
      onlyTabData: [],
      // 图片上传到的api地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 请求头
      headerObj: { Authorization: window.sessionStorage.getItem('token') },
      // 保存预览图片的url地址
      previewPath: '',
      picDialogVisible: false
    }
  },
  created() {
    this.getCateGories()
  },
  methods: {
    // 获取所有商品分类的数据
    async getCateGories() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类失败')
      this.cateList = res.data
      this.$message.success('获取商品分类成功')
    },
    // 商品分类改变时触发事件
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        return
      }
    },
    beforeLeave(activeName, oldActiveName) {
      if (oldActiveName == 0 && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    // tab被选中时触发的事件
    async changeTabs() {
      // 先判断当前页是否为商品参数页
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'many' } }
        )
        if (res.meta.status !== 200) return this.$message.error('获取失败')
        this.manyTabData = res.data
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals == 0 ? [] : item.attr_vals.split(',')
        })
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'only' } }
        )
        if (res.meta.status !== 200) return this.$message.error('获取失败')
        this.onlyTabData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.picDialogVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // file将要移除的图片临时路径
      // console.log(file)
      const filePath = file.response.data.tmp_path
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response)
      // 1.拼接得到一个图片的信对象
      const picnfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象push到pice数组中
      this.addForm.pics.push(picnfo)
      // console.log(this.addForm.pics)
    },
    // 添加商品事件
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 通过深拷贝拷贝一个新的addForm
        // 使用lodash   cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        //将goods_cat从数组转换为"1,2,3"字符串形式
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTabData.forEach(item => {
          const newData = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          form.attrs.push(newData)
        })
        // 处理静态参数
        this.onlyTabData.forEach(item => {
          const newData = { attr_id: item.attr_id, attr_value: item.attr_vals }
          form.attrs.push(newData)
        })
        // console.log(form)
        // 发起请求
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    // 通过计算属性获取对应的分类id
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.el-button {
  margin-top: 10px;
}
</style>


